Description: 525 synthetic resins or natural rubbers -- part of the class 520 series / 525 synthetic resins or natural rubbers -- part of the class 520 series/() synthetic resins (class 520, subclass 1) (50) mixing of two or more solid polymers; mixing of solid polymer or sicp with sicp or spfi; mixing of sicp with an ethylenic agent; mixing of solid polymer with a chemical treating or ethylenic agent; or processes of forming or reacting; or the resultant product of any of the above operations (55) at least one solid polymer derived from ethylenic reactants only (63) mixing of solid graft or graft-type copolymer with other solid polymer wherein one of said solid polymers is not derived from ethylenic reactants only; mixing of said polymer mixture with a chemical treating agent; or mixing of graft or graft-type copolymer with a sicp or spfi; or processes of forming or reacting; or the resultant product of any of the above operations (64) solid graft or graft-type copolymer derived from ethylenic reactants only (68) with solid polymer derived from at least one phenolic reactant wherein at least one of the reactants forming the solid polymer is saturated; or with spfi wherein at least one of the necessary ingredients is a phenolic reactant or with a reaction product thereof; or with phenolic-containing sicp
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